Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é 2008, quando 2006 é "Grand Slam Tournaments"?
 ###Tabelas: CREATE TABLE singles_performance_timeline (singles_performance_timeline_id AUTO_INCREMENT PRIMARY KEY, Tournament VARCHAR, 2000 VARCHAR, 2001 VARCHAR, 2002 VARCHAR, 2003 VARCHAR, 2004 VARCHAR, 2005 VARCHAR, 2006 VARCHAR, 2007 VARCHAR, 2008 VARCHAR, 2009 VARCHAR, 2010 VARCHAR, 2011 VARCHAR, 2012 VARCHAR) CREATE TABLE season_18:_1954 (season_18:_1954_id AUTO_INCREMENT PRIMARY KEY, Episode VARCHAR, Title VARCHAR, Writer(s) VARCHAR, Preservation VARCHAR, Original airdate VARCHAR) CREATE TABLE filter_classes (filter_classes_id AUTO_INCREMENT PRIMARY KEY, Usage VARCHAR, Class VARCHAR, Performance VARCHAR, Performance test VARCHAR, Particulate size approaching 100% retention VARCHAR, Test Standard VARCHAR) CREATE TABLE season_5_2008–09 (season_5_2008–09_id AUTO_INCREMENT PRIMARY KEY, Series # INT, Season # INT, Title VARCHAR, Directed by VARCHAR, Written by VARCHAR, Original air date VARCHAR, Production code INT) CREATE TABLE participation_and_medals (participation_and_medals_id AUTO_INCREMENT PRIMARY KEY, Games INT, First INT, Last INT, Gold INT, Silver INT, Bronze INT, Total INT, Best finish (first/last) VARCHAR)  
SELECT 2008 FROM singles_performance_timeline WHERE 2006 = grand slam tournaments